I would suggest you look at it from a different perspective. Corals can be placed at various depth within an aquarium (species depending) but certain species are only at their best when under an intense focused light. So in terms of what you've posted above...
Look at the low-med types as PC
or T5HO dependant and intense lighting as MH
/Fluor combo's. Still not a good way of looking at it but I think you get the idea. Watts/gal
is pretty much a useless guideline to use. More importantly is intensity vs depth.
@ 20" high (?), your 2x96w should support a wide range of soft and LPS
corals without issue. Certain less demanding SPS
might also be possible if placed midway or higher in the tank.